Presents an introduction to current equivalence methodology, a preferred alternative to usual power analyses when one wishes to determine if performances on given outcome measures for different samples are equivalent (could have come from the same population). Examples of the approach are presented. (SLD)

Articles in this special issue use survey data to provide policymakers with validated indirect needs assessment models that will help them obtain information about populations requiring different levels and types of mental health services. The articles provide the basis for predictive needs assessment and explanatory models of resource allocation.…

The seven articles of this special section explore evaluation in South Africa. Particular emphasis is placed on policy development in the areas of health, education, and housing and on efforts to alleviate the legacy of apartheid. Participative and quantitative efforts are described. (SLD)